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Comparison to the averaged certified reference materials (CRM)‐adjusted concentrations. Comparisons to the averaged CRM‐adjusted concentrations were made across platforms (A) EUROIMMUN, (B) Fujirebio, and (C) Roche. The solid blue line represents the Passing Bablok regression fit and the dashed red line indicates the identity. Symbols: CRMs (red circles) and cerebrospinal fluid (CSF) pool (black circles)
